Printable Hard Sudoku

Set 19nh3sr. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
5 2
1 6 3 5 4
2 9
5 6 9
4 8 7 2
6 4 1 8
6 1
3 4 9 2
1 4 6
Hard #2
7 9 2
6 4 7 8 5
2 3 8 6
5 6 2
5 9 3
9 7 2 4 6
9 3 5 4
6
1
Hard #3
4 1 2
5 3 7
1 8
6 9 5
3 2
2 1 3 9 6
9 2 7 3
1 4 6 8
2 9 1
Hard #4
4 8 2 9
6
9 3 4 7
8 2 1
7 9
2 1 9 5 4
1 4 7 3
2 1
3 1 8 9
Hard #5
2 7 8
8 1
7 6 9 4
8 7 1 9 5 2
5 4 7 1
1 3
1 6 4
5 1 6
8 2
Hard #6
2 3
1 8
7 9 6 3 5
3 2 7
9
7 3 4 6
7 6 5 8 3
8 4 2 3 1
8 2
Hard #7
5 1 7 4
1 9 6
7 6 1
8 3 5 9
3 1
6 9 2
9 5 2
2 4 5 7 3
8 6
Hard #8
5 8 2 6
7 9 4 1 3 8
8 9 5
9 5 2
8 1 3
6 8
5 2 7
1 4 8 3
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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